Hi, I'm starting a 30 gal tall seahorse tank soon and would like to know which macroalgae (if any) would work in a 24" tall tank with LED's. The lighting will be an led that come with the half-moon 30 gal Marineland aquarium (haven't purchased as of yet). I can use this or upgrade to better lighting if needed for the macro's, but I've read that seahorses prefer the light to be on the low end...is this true?